fix: stop changing icon during chat #231
                
     Merged
            
            
          
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Before this change, the chat icon would change based on the tool that was being called. For example, if an assistant was using a tool that needed to prompt the user, then the icon would change to the initials for that tool. After this change, the icon will only change when the assistant changes.
A side effect that is also addressed in this change: restoring a thread now has the correct icons for the messages. This will only be true for threads created after this change.